[tex]\displaystyle\bf\\+\left \{ {{7x-y=10} \atop {5x+y=2}} \right. \\--------\\12x=12\\\\x=12:12=1\\\\y=2-5x=2-5\cdot 1=2-5=-3\\\\Otvet \ : \ (1 \ ; \ -3)[/tex]
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[tex]\displaystyle\bf\\+\left \{ {{7x-y=10} \atop {5x+y=2}} \right. \\--------\\12x=12\\\\x=12:12=1\\\\y=2-5x=2-5\cdot 1=2-5=-3\\\\Otvet \ : \ (1 \ ; \ -3)[/tex]